生物质流化床气化焦油析出特性的研究

生物质气化中焦油的存在严重地影响了气化设备的正常运行。为了了解生物质流化床气化过程中焦油的析出和脱除特性，以花生壳、稻草以及木屑为原料，采用流化床气化反应系统，研究了气化温度(750℃～850℃)、空气当量系数(0.15～0.35)以及催化剂(白云石、橄榄石与菱镁矿)的添加等对气体产物中焦油的析出组成特性的影响，并采用色谱 质谱联用仪对焦油的主要成分进行了分析。实验结果表明，随着温度的升高，焦油的量快速降低；催化剂的添加也有类似的结果。这说明高温和催化剂有利于大分子焦油的催化裂解。

Evolving characteristics of tar during biomass fluidized bed gasification

Tar in gas product from biomass gasification would block the downstream equipments and affact the gasifier operating. It is important to understand the tar evolving and cracking behavior in the fluidized bed gasifier. With peanut shell, rice straw and saw dust as raw materials, the gasification was carried out in a pilot scale fluidized bed gasifier at variant temperatures (750℃～850℃), air equivalence ratio(0.15～0.35) and catalyst addition. Simultaneously, tar component was analyzed using gas chromatograph with mass selective detector (GC-MS). It is observed that the tar content decreases obviously with temperature increasing, and the catalyst addition also displays a similar result, which is attributed to the cracking of heavy components in tar. Higher temperature and catalyst are effective for the controlling and removing of tar during biomass gasification.